Machine for bending pipe.



G. GORDON,

MACHINE FOR BENDING PIPE.

APPLIOATION FILED 001'. 2B, 1907 2 SHEETS-SHEET 1.

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G. GORDON. MACHINE FOB BBNDING YIPB. APPLICATION FILED OCT. 28, 1907.

91 3,004. Patented Feb. 23, 1909. 2 BEEETE-SHEET 2.

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W. [62444 'fi/iwfi UNITED STATES PATENT OFFICE.

CHARLES GORDON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO WHITLOCK COIL PIPE COM- PANY, OF WEST HARTFORD,

CONNECTICUT, A CORPORATION OF CONNECTICUT.

MACHINE FOR BENDEN'G PIPE.

Specification of Letters Patent.

Patented Feb. 23, 1909.

To all whom 'it may concern.

Be it known that 1, CHARLES G0 Donna citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in a Machine for Bending Pipe, of which the following is a specification, accompanied by drawings forming a part of the same, in which- Figure 1 represents a side elevation of my improved ap aratus. Fig. 2 represents a front view. Fig. 3 is a side view of a portion of the apparatus showing a piece of pipe to which a semicircular bend has been given by the operation of the machine. 4 is a side view of a portion of the apparatus showing the position of the bending roll reparatory to the o eration of bending t e pipe, Fig. 5 is a si e view of the same, with the bending roll moved into effective position to accomplish the bending of the pi e. Figs.

4 and 5 also show a modlfication o the means for determining the curvature of the, pipe. Fig. 6 is a front view of the burner, and Fig.

7 1s a sectional view of the burner on line 77, Fig. 6.

Similar reference figures refer to similar parts in the different views.

The object of my resent invention is to provide a mechanism or automatically bendmg pipe, especially of the larger sizes and itre a tes to certain improvements in the pi e bending machine as shown and described 1n- United States Letters Patent No. 785,083, issued March 21, 1905.

B means of my present improvement] app y the bending strain tb the pipe throu 11- out the entire 0 eration at a constant 'stance from the eated section of the pipe, and at a constant angle to the axis of the ipe, thereby renderin the bendin strain orm and rendering the action 0 the apparatus continuous and automatic from one end of the operation to the other.

The machine embodying my present invention comprises an n right framework 1,

1, and a horizontal tab e 2, provided with ways for a travelin carriage 3, upon which is mounted a'vertica l pushing-plate 4 adapted to bear against orie end of the-pipe 5't0 be bent. Journaled in suitable bearings at the rear of the upright frame 1 's a ipe supporting roll 6, and at the front of frame 1 is a fulcrum roll 7 journaled'in bearings supported by plates 8 which are adjustthe upright ably attached to the upright framework 1 enabling the fulcrum roll to be raised an lowered according to the diameter of the pipe to be bent so it-will bear against the upper surface of the pipe. The carria e 3 is provided with a depending lug 9 w ich is connected by a cable 10 with a sliding crosshead 11, attached to the outer end of a piston rod 12 and capable of sliding along ahorizontal track 13 as it is moved b a iston equi ped hydraulic cylinder 14, ti ie irection o the motion of the cable 10 being changed by means of the pulley 10.

In front of and contiguous to the fulcrum roll 7 is a burner 15 su ported concentrically with the pipe to be iient. The burner 15 may consist of a Bunsen burner or any suitable type adapted to the use of gaseous fuel which may be supplied through a gas pipe 16 and air pipes 17 in the ordinary method of burners of this class.

The construction of m improved bending machine, as above descri ed, is substantially like that described in the Letters Patent aforesaid No. 785,083. The pipe to be bent is su ported with one end upon the carriage 3 an with the opposite end entered between the supporting r0 1 6 and fulcrum roll 7, and

rejecting a short distance through the burner 15, as shown in Fi 4, and the bending of the pipe is accomp ished as short sections of the pipe are successively heated by the burner 15, while the i e is being 101 tudinally pushed forward iiythe hydrau ic cylinder 14 against the resistance of a bend ingstrainappllied to the pipe in front of the burner 15.

y present machine, however, differs materially from that described in Letters Patent No. 785,083, in the application of heat to the ipe, and in the method of applying a hen ing strain to the Instead of extending. the burner entirely around the pipe and applying heat uniformly to its entire circum erence, I provide a'narrow ga 18 at the upper side of the burner, there y leaving a narrow stri on the upper side of the ipe to which the ame of t e burner is not directly applied, and inconsequence hasa lower temperature than that portion of the pipe which is inclosed within the burner. By heating the up or surface of the i less than the sides an lower surface 0 t e pipe a sort of backbone is provided on the inside of its curvature, which, while not materially impeding the bending ipe. V

of the pipe, upsetting of side.

In front of the burner 15 I rovide a bending roll 19 which is 'ournale in eye bolts 20 and 21. The eye olts are provided with screw threaded sections 22 and are longitudinally adjustable in blocks 23 by means of nuts 24. The blocks 23 have a swivel connection with the framework, and b the longitudinal adjustment of the eye bo ts 20 and 21 the position of the bending roll 19 may be varied relatively to the pipe. When the pipe is first inserted in the machine the bending roll is lowered to clear the pipe, as shown in Fig. 4, and a bending strain 18 applied to the advan end of the roll by raising the bending roll y means of the longitudinal adjustment. of the eye bolts into the position shown in Fig. 5. The higher the ending roll 19 is raised, the shorter will be the radius of curvature imparted to the pipe, and the position of the bending roll to secure the desired curvature may be determined'by either one of two methods. One method of determining of the pipe consists in applying a collar 25 to the en of the pipe and connecting the collar by means of a hnk 26 to a rocking shaft 27 'ournaled in eated ortion of the pipe, when the length of the 26 will determine the radius of curvature as the pipe is pushed forward through the burner 15. The curvature being thus established, the bending roll is then brought up into close contact with the under side of t e pipe by the adjustment of the eye bolts 20 21 as shown. in Fig. 1. The collar 25 26 are then removed and a bending strain is ap lied to the pi e by the pressure of the ban roll 19. y another method of date the curvature of the ipe, an ban is im arted to. the pipe y rais' the hen 1'0 19, as shown in 5, an the-desire curvature is determine by means of ,a measuring bar or age rod 29 which is adjustablein length an is suspended from the rocking shaft 27, the axis 0 said shaft in both cases being the center of curvature. When the gage bar 29 isno lo erinuseitmaybeswungu ward against t e upright frame, as shown in By my improv machine the ben strain is ap lied during the whole operation at a single ed point at a uniform distance from the heated section of the pipe, so that the force applied to the pipe is constant both in amount and direction, which is not the case when the bonding is accomplished by the collar 25 and link 26, as shown in Fig. 1, for the reason that the collar is continually moving awa from the burner as the (pipe 5 advances. fact, the collar 25 woul soon be moved into a position where it would prevent instead of produce the desired curvaefiectually prevents the undue the pipe on its concave or inner the curvature combination of a brackets 28 directly over the ture of the pipe, either requiring its position to be changed or additional collars and links to be employed.

The bracket 28 carrying the rocking shaft 27 is vertically adjustable upon the upright frame 1, in order to enable the radius of purvature of the pipe to be varied.

I claim,

1. In an ap aratus for bending pipe, the combination 0 a pipe supporting roll, a fulcrum roll arranged to contact with the opposite side of the pipe, a bending roll arranged to contact with the side of the pipe opposite said fulcrum roll, means for adjusting said bending roll relatively to the pipe, means for heating a section of the pipe between said fulcrum roll and said bending roll, and' means for longitudinally moving the pipe between said rolls.

2. In an apparatus for bending pipe, the pair of rolls arranged to contact with one side of the pipe, means for adjusting one of said rolls relatively to the pipe, a fulcrum roll arranged to contact with the opposite side of the pipe and in a plane between said pair of rolls, means for heating the pipe between said fulcrum roll and the adjustable roll of said pair of rolls, and means for moving the pipe longitudinally between said rolls.

3. In a machine for bending pipe, the combination of means for a plyin a bending strain to the pipe, means. or app yil heat to a limited longitudinal section of t e pipe, and means for maintaining said bending means in a fixed relation 'to said heating means. i

4. In a machine for bending pipe, the combination of means for applying a bending strain to the pipe, means or heating a limited longitudina section of the pipe, means for maintaining said bending means in a fixed relation to said heating means, and means for imparting a positive predetermined pushing force to the pipe.

5. In a machine or bending pipe, the combination of means for applying a bending strain to the ipe, means for adjustably vary ing said ben ing strain, means for heating a limited longitudinal section of the pipe, means for maintaining said bending means in a fixed relation to said heating means, and -means for applying a predetermined positive pushing force to the end of the pipe.

6. In a ipe bending machine, the combination wit a bending roll for applying a bending strain to the pipe, and means for supporting the ipe against a bending strain, of a burner for eating a limited longitudinal section of the pi e, and means for holdi said bending rol in fixed relation to sai burner.

7. In a pipe bending machine, the combination of means for supporting a pipe against a bending strain, means for applying heat to a limited lon itudinal section of the pipe, a bending roll En applying a bending strain to the pi e, and means for adjustindg said bending ro relatively to the pipe an also to said heating means.

8.In a pipe bending machine, the combination of means for applying a bendingstrain to the pi e, means for heating a limited longitudina section of the pipe, means for maintainin said bending means in ,a fixed relation to sai heatin means, and means for imparting a longitu lnal movement to the pipe relatlvely to said bending means.

9. In a pipe bending machine, the combination of means for supporting a pipe against a bending strain, means for applying heat to a limited longitudinal section and to a limited peripheral section of the pipe, a

bending roll for ap l a hen strain to the pipe, and mean 201' iolding iii d bending roll 111 a fixed relation to the heated section 0 the pipe.

10. In a machine for bending pi e, the combination with ben means, 0 means for heatin a limited longitudinal section of the pipe t oughout a portion ofits periphery, and comprising a burner inclosing a portion of the pi e an having an open space on the side of t e pipe having the least bend, whereby the periphery of the pipe is uneqilall y heated,

Dated this 23rd da of October 1907.

. C RLES GORDON. Witnesses:

'E. H. Teena, E. D. Rnnmnm. 

